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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40200efea59a57b226878f2c00cde7d53a4ee0fe13c4062873ceda4f064bbdf5' 
  AND token = 'J1Cyu+/kw2WPcP4CTWZ9Hr2528ldVxXnRApzZl5UP/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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