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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f24c19413f8ddd7844a24b9af33a6d465ff03f4bf813edd09ada63ee5413b51' 
  AND token = '0vZQjnCrO4FMzjbVR5ogPab3AWy34kXJYel1jrHelVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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