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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1674af642596ab224a4cb29fbee02058cac44f9e007b146075cdb086d01da5a4' 
  AND token = 'SvhVzg0oydcHpFXIyk012p6rJ2fiAMEnznd+T2pPF/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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