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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9711a210f4a458a18ef46d9787b7fe4503ac3e11435aa5f3c67ee5d362674734' 
  AND token = '4WuDL5OSB6+xQQIBSxI+cV1+jp14TnwyPV+bids1qKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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