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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '194afc22d451d18ecac0add996340c169be1503733ec6587a2150be15fcdc61e' 
  AND token = 'r4AA9Ccvn165fnefoPecnackhfRUUkHe2tmGrlBNjwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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