SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9319236f74990b2ee85d57e949da68010568d44badc5a836f93384a8c4625df2' 
  AND token = '3VXRuY9WSxVD3ZY7SBut6zuBXZ6JCeo+r6fbO9pIq+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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