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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3deea6258eac0e4cbc9c0c4eed0edc41eae2ef8b00b3a20dadc760cb43f40201' 
  AND token = '3XdPI554miqjZMZGm6bUZD3fdUXRg2rDIXXZ42pz7Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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