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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4ef45b1ad8a02bef80b2782e1aee8d23a3b15c6d3b21e858ed447a88d20b772' 
  AND token = 'Eq2VBQ2ngih2MqRUlPqY2PAA7ej5wqCp3ZuX8RMfyIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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