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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3069412139db80fd88808e558d76062c4f87c140b567ea02ce2c176013cd1c9c' 
  AND token = 'x6eVv3renPHSa2H/+K1FbfosjVpIew/32qnf+YLH9Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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