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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39f1db782090c71a7c0517a03c6696a9de28da73b7eb5ea62a0975d8c34cf27e' 
  AND token = 'HeU0D8KI5Y2xPuKJ5cXk81cRSxoaTtU2KxeH4iytB4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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