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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16cf362e7a56d5cdbf0e55a1ba9c98d48b87f40bf0bd46fc11ef01975a1c9951' 
  AND token = 'Cs86KqfKXToqEXL2FPGZhB4Ripiuy027EBE3d88Gre8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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