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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8acee47c6604eb81b03ffce7cc3112e55901d95ed83ca62d6986ba675ebbeb8f' 
  AND token = 'dok053edTk+Isn/Z3aC24YWexu9iqSe6CCmDSpQ3Fkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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