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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '384e43d1a6448c1b1519093666339e0069b5ea88d85ffbcbdd21d411addd5e74' 
  AND token = '9lqfG5eunlEis7TfEDf11CgZrfSEMY1bwJN+gFPxjnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}