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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4781ad5b7f41ab1537fa9edd4b05bcaa8e9bda2997d2fd7e25be3da94cd13a39' 
  AND token = 'PgKTfYheUN0kgqg26AywYu5OGc7vsW3/Y0Vkd8o9bPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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