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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '673cb100dbf7a76e11a500a13287647f9f8508864061bab3c515751943f4c5f1' 
  AND token = 'LwMf8kI3b1snoqLG1XY8syd4qthuHWYXks9Ar6cIJRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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