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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f5056695877a8725af3409faeadeeace92aec7e0f330ea56b227721d724b7df' 
  AND token = '1dqQ6o6KrfMsJ2fyLdJf7VUqB2PfOR8AjJGfbC4y5hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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