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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6ae44a33c5f0df41cdf701d843354afff921c4a36d721b614e9578b5b9f4739' 
  AND token = 'IsRJXAgDD8uNd9PlAaicoGJp4ALzrR+lRuxE/Yl2Iyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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