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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd38e0bcd09e239ea04e5c8b5b4068ed54f73b753948c9f73882f092b99e61510' 
  AND token = 'e6ONlyiWirVl/E7nHEvcMi94ZCxxTP9Jwcxlt+QmdxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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