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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7be4a77ed1fb25f9ed35df85f08927066bf4078b7247e8102a059d17972c5762' 
  AND token = '53nAPA8xY6Sa1GvLI8OeYQcwvoPPnZtI2wq0iuedCLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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