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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '738ec58492f5d077d3751700d58e7e96fdb312a6ed9d7ca97ce65dba5d477111' 
  AND token = 'WxFAsVzpcQptoIs0j4/YwOk0T40H7KAf2StPZ/PNi4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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