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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bffe90433187efd0f0d76bccaeffd699fb485ae57ce7be08589c9750598f2c61' 
  AND token = '9t+p5bJstilLDz4qmJzKd3lzLTmqEWJEw9hFClp3bUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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