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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1da5bfce109813c32ccb0d2aca2b9690134e2e993065a49d216e3debfc3b8e4' 
  AND token = 'JrAn19VcK/LXZkjhg7PPZrIoJRlTsaXnRfQTLKCrK2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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