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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '984bdb89265d8a413c77355199637cde2979d161a9d8798037644344dc49cfda' 
  AND token = 'knyR9s/6fiMfGYxvSY6Y5DWkPjoHa4RgIlEB9kWgVd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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