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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aac1920bf3aaf3c9a9c136186d583aa84ed199345b69bbe5d08bd4cb06280e86' 
  AND token = '+ragerZB1pKBge8o1nB8lkN7c72FQeF4NXws+Axny1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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