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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '342fc3216d48939be34a3cbc51ddd34a5c608ae741c3150d2fbe3bc536110f04' 
  AND token = '+0IQQuQJCD8Qsb1NqersZ1zb7ISULhb+ZuPvSM41ETs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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