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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37f84684dd1b1137d8ddc691984cafbc4661c273730ab8297fe500f1425a4841' 
  AND token = 'oMxiCWqj+W6FHpLcbA+tBvtA0D0Qq5E9CWGml21Zqy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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