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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95e03255596d4742518b456c5f1b2890b8555d12f9990a4e35d03b2f1d22293d' 
  AND token = '9ry/B86oaq4hOiao3wLaHUSLWSroEBMrZigj9iaDHE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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