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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cebc9dfdec428ab45c0bcc273da4ef12355726217d3894aa68e87e3f5018d7d' 
  AND token = '5odzf3tzEeRcC1/9BBglF1U5eIEcTHWlkKNiZLpSGmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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