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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '854c4d1e9376052d3bf7c3a0af64d7d53a111a7382658a67f45a1b386801c8b8' 
  AND token = 'l6vxFvrs1XpnSQVoad0gCcRehan9t3q+J/Q7uXbM/WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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