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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f6a2a26c1cf1473b57f353e19c8383b1f731d5e14a912ed6c406f24de4ffa23' 
  AND token = 'prFc2ULcMxTtiGCfHgX6vFvDuF75V9OrFlB0Q3NQwcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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