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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd85e79be69d9f8e2f6565e52b712d8fc1d78d80d1e9290775fa78dad7edfa9eb' 
  AND token = 'oO5CJDsXybS0YuZ2ZzKmvOSaEihg29R4eo0jA/ajiJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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