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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8098440bb24c59e0847ba0758485f098fdaf155c596631739639dabb0d164c07' 
  AND token = 'dLt0Kn/VfPcgpqsfzAiAkeKmg0eCuy0Wpa8foSHaq60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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