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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44a8be08a825159b46c7c9c81218682be25880aa9ea8e9a40b5f05e6ceed930d' 
  AND token = '+F515NZ8eg9WPOukWG4O7oZKqxguTooFtwwY2c4DE5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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