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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3deab01a1c9baa4791da1224a3c8ee1e138812ecc7f184e3a870df58191d7b1' 
  AND token = 'rP2JY1klMLSLe8swIAxcDlP1dO51d0bU97FrFsX21LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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