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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6050404f9669aebea1bced336e7a168529af4e577005c80dbfc7b5b7ca61526b' 
  AND token = 'heimEZpGIo6R9zBIQ1niW18K6lkkQaE1KDZSlq1x798=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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