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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc9a0f56d4d2ebb9bb268c1d5a55fb8d4c65a002ed5e578eff33c794a84ccc69' 
  AND token = 'L6cV4VqXFyrX9NQXagCn0mZtOz4RYbdN2bO3SfQ+vHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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