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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54bfb58bca30c5f306d8d3b702803f12dbb0eb8a203ff418fe7dc667120e4708' 
  AND token = 'r4kIdNOTJg1XTPDp4SH+bXryao5bqALPS0ZKxZIk77M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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