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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d807ca79cb1a2791db92e7826522dbe00bf3e30802be7790465b9f099a46543' 
  AND token = 'z9RP7fepDZLZfaNzuzxKFLPOrlic+uuuPAXDK+s//rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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