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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4171e697da3ad66ca583c22d141e2fa5c031e87bf0006eb19ed42ec0a5fcddcf' 
  AND token = 'pXgaa9AsgKYwtpJJNe3at5w96BAreVL0Hji0TnN9hN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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