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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ddba46a36e6d42782097c48c10dd640a9bbae03ac9529fa3e53dc4b8350bf4d' 
  AND token = 'sRlE05NxwysDCNE3Oap39M5tOyYU91Zw5ivXKcob7w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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