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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1563819492ad21dc861adff781a88aada524877a023a119717bd192beda03aad' 
  AND token = 'Ap3nc8K3e3ywFggjuNoW+f1XxSuTvhp3C5FJUcRS+ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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