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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad40cf3c136719898cb310c2471fd9ed7fcad8580d9616c43b5a7c6af462996c' 
  AND token = 'lQpin0/jWq5t0dAFm1N9UnwC/NVK8y9u4PUg11ZN0pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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