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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9559db83c372241a0fa0f1adbc3c14fa95809d720fef8df49bc4a33b88ac96f7' 
  AND token = '16br131eUUqVyO3B0oPC8Od1GkhJZU77Ds2mQXkONKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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