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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a68ff485d58a3b0afe8175e97c0554b9c50149c64d46a0edcb4730de949d6cdf' 
  AND token = 'CSzgIpTxEfjDabfVUFxrvBEsarZGJagdJ3CKtnkPvWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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