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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf259c4c7a1ad5647da474de18dc859e4c2c405cb5f6fbea7d6d04e707cafb11' 
  AND token = 'd9jecMrVH1RYzZ9kAri0YysFewLtirl7Jf3FBjDk+K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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