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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88d6eff10edffd22a36f6a71b303b98270b76697736cbcbb67f2ae1d247ad1bb' 
  AND token = 'jwFIFas5KcAZmPa27yKbt5sgiirVv9McqDL/l0wgEaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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