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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58651375113d1b6eb8b4563ea9ad3e4a179bd1509fe8918b84d9954c0b3f9d57' 
  AND token = 'spn0IlVJGnPvE250ZaPKggOfrPcxp0v/tyTLr5uJNtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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