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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fdfee5df447b72e60ccd35d74c45fec20ae678afff9073a3a14bae0727dc139' 
  AND token = 'aHO82Nfmn7KKZuj5IojdS9QaD8QiByVrKECLGNCF6iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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