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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1915384390dc250a24be74bf9ae0ae4711b7da05fdcb62c4e0e3e900c80aaa53' 
  AND token = 'gapZqeF99yH76Qg+bzyw59/sHZCLslCRjyIfxSaDYeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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