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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a619237620aa4efb0d525d9d7f8c0c8cfd21939252237c4de29adff782eaa73' 
  AND token = 'Qdj3GY2mEprDi0Vkex63p7HDxq0SiXOKHTi+1Pj571s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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