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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd754cb8e9f83e8f0732a19bf13cdddc4726c3b76e20e9ff741e639cca62661e' 
  AND token = '6X7R762UuyQYHiJsmZJxjNHiHZ/3gctsec11gX/ctkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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