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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a434bb70100444b79c95d3e5ee7084cf76e937a3b0d25d15f4d3df50a3e887ff' 
  AND token = 'RJaMN1BMRiuAMfzr0KMdsJ5ljYenL+6gWZtc7ForCp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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